2
HV9910BDB2
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
Connections
Connect the input AC voltage between the AC IN
terminals as shown in the connection diagram.
Connect the LED string between LED+ (anode of LED
string) and LED- (cathode of LED string).
Connect the PWMD terminal to the VDD terminal using
the jumper provided to enable the LED driver.
The current level can be adjusted using the on-board
potentiometer.
1.
2.
3.
4.
PWM Dimming
The HV9910BDB2 is capable of being PWM dimmed by
applying a square wave TTL compatible signal between
PWMD and GND terminals. However, since there is no
galvanic isolation on the board, care must be taken to
prevent damage to the PWM dimming source and/or the
HV9910BDB2. One simple way is to isolate the LED driver
from the AC line using an isolation transformer. Another
approach is to use an opto-isolator to drive the PWMD pin
as shown in the figure below.
VDD
PWMD
Opto-isolator
(eg: LTV-814 from Lite-On)
5.0V
square wave signal
(<1.0kHz)
3.8kΩ
Efficiency vs.Input Voltage
60
65
70
75
80
85
90
80
130
180
230
280
Input Voltage (VAC)
Ef
fic
ie
nc
y
(%
)
40V output
10V output
Efficiency vs. LED String Voltage
60
65
70
75
80
85
90
0
10
20
30
40
50
LED String Voltage (V)
Efficiency (%
)
110VAC Input
230VAC Input
Current Regulation vs. Input Voltage
-10
-5
0
5
10
80
130
180
230
280
Input Voltage (VAC)
% change in LED Curren
t
40V Ouput
10V Output
Current Regulation vs. LED String
Voltage
0
5
10
15
20
0
10
20
30
40
50
LED String Voltage (V)
% change in LED Curren
t
110VAC Input
230VAC Input
Typical Results
